Icom IC-M604 - Microphone Voltage Diagrams

12 - 4
12-4 HM-126RB/RG
J1
1
2
3
4
5
6
7
8
S1
S3
S4
S2
MC1
SP1
R1
12k
R4
33k
R3
15k
R2
6.8k
R5
15
W3
W4
W2
W1
C2
470p
C1
470p
PTT
UP
DOWN
16/9
W1 (CHASSIS)
HANGER
UP KEY : 2.0V
DOWN KEY : 3.0V
16/9 KEY : 3.8V